Auger or drill for boring rock, &amp;c.



PATENTBD NOV. l5, 1904.

E. CACHELIN. AUGBR OR DRILL FOR BORING ROCK, 6m.

APPLICATION FILED AUG. 22, 1902.

Zzneses: @Mw/4L,

Patented November 15, 1904.

PATENT OEEICE.

EDWARD CACHELIN, OF SPEARFISH, SOUTH DAKOTA.

'AUGER OR DRILL FOR BORING ROCK, &o.

SPECIFICATION forming part of Letters Patent No. 774,933, dated November 15, 1904.

Application filed August 22. 1902.

&c., of which the following is a specification. Y'

My -invention relates to improvements in angers or drills for boring rocks, &c., and has for its object a device simple in construction, durable in character, and efficient in operation, and one which can be easily and readily repaired when necessary; and for these purposes it consists of the combination and arrangement of parts hereinafter set forth and claimed.

In the drawings accompanying this specifi-` cation and made a part hereof, Figure 1 is a side view of an auger or drill embodying my invention, and Fig. 2 is a bottoni view of the same. Fig. 3 represents a longitudinal section of the coil portion thereof. e

Similar letters indicate like parts ofthe several figures.

In the drawings, A designates the body of the device, consisting of a shank and a coiled portion, preferably formed of a piece of toolsteel coiled as shown, thereby forming lower and upper edges Cand D, respectively. The upper edge D is of greater thickness thanv the lower edge C, causing the former to project outwardly, forming a rib C on the outside of the auger, thereby aiding in the feeding and also in preventing a binding of the coils by stitfening the said edge, and thus permitting more readily the escape of the borings or pulp.

The point-tooth A', which projects outward and downward from a recessed lower end of the coil, is formed by beveling or sharpening the inner face of the cut-away or recessed lower end of the coil, and the drag-tooth B is formed by making theY notch a on the lower edge C adjacent to the tooth A and beveling or sharpening the inner face o f the wall b of said notch. Owing to the distance of the drag-tooth from the point-tooth, there is a free escape of the same from the borings cut by the point-tooth.

The bore of the coil at the toothed end is Serial No. 120,698. (No model.)

Y slightly smaller than at its end G, where it is connected with or joins' the shank, so that there is ample room for the borings or pulp to pass out, and thus prevent choking of the bore of the coil. The diameter of the coil may be of any suitable size as desired for work. rIhe shank E is welded or other-wise suitably connected to a tubular pipe F, having a screwthread thereon or otherwise suitably adapted to connect with a drill-stock or an operatingshafting. y

It will be seen that a device as thus constructed is simple in character while eiiicient in operation.

Having thus described my invention, what I desire to claim and secure by Letters Patent isl. An auger or drill having a shank with a coiled lower end, the upper edge of the coil being of greater thickness than its lower, forming thereby an outer rib on said coil, substantially as and for the purpose set forth.

end provided with the point-tooth A', and a drag-toothB, in rear of said point-tooth, the upper edge of said coilvhaving an'outer rib thereon, said parts being arranged and combined substantially as described.

3. An auger or drill consisting of a piece of metal having a shank with a coiled portion provided at its lower end with a point-tooth and a drag-tooth; the bore of' said coil being of less diameter at the tooth end than at the shank end, said parts being arranged and combined substantially as described.

4. An auger or drill, consisting of a piece of metal having a shank with a coiled end and a tubular portion connected to said shank, said coiled end having a rib thereon and provided with a point-tooth and a Adrag-tooth,

V,each of said teeth having cutting edges and the bore of the coil being less at the tooth end than at its shankend, said parts being combined substantially as described.

In witness whereof I hereunto set my hand .in the presence of two subscribing witnesses.

. EDIVARD OAOHELIN.

Witnesses:

R. F. CRAWFORD, J oHN OASHNEE.-

2. An auger or drill having a coiled lower 

